Vol. XXII, pp. 153-156 July 28, 1909 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NEW CLADOCERA FROM NEW ENGLAND.* 



BY ALFRED A. DOOLITTLE. \/^.J^^^- 



r^ 



Cooperating with the investigations of the New England 

 Lakes conducted hy the U. S. Bureau of Fisheries, the w'riter 

 has found in the plankton of some of the waters visited two 

 species of Cladocera which do not seem to have been previously 

 described. One of these is the type of a new genus. A more 

 complete description of these species with figures may be looked 

 for at a later date, probably in one of the publications of the 

 United States National Museum. 



F.VMn.y :\IACROTHRICIDAE Norman and Brady. 

 Genus PAROPHRYOXUS gen. nov. 



Tijpc. — Parophryoxus tiibulatus sp. nov. 



Oval or eliptical, evenly rounded anteriorly, produced posteriorly, 

 tu})e-like. Cervical sinus present. Sides concave. "With distinct rostrum 

 and keel from near tip of rostrum to near posterior end. Eye and ocellus 

 present. Antennules long, not greatly curved, with lateral sense seta, and 

 distal olfactory setae, otherwise without conspicuous armature. Antennae 

 of female with setae 'VoV; spines Vo"r ; '^'^ male, setae VoV» supines as for 

 female. Labrum with anterior and posterior lobes curved toward each 

 other forming a window-like opening. Maxillae with three teeth; feet, 

 six. Postabdomen slender, triangular, both sides irregularly sinuous. 

 Armature obsolescent, claws long, with two basal spines. 



Remarks. — The superficial resemblance of specimens of this genus to 

 Ophryoxus disappears on closer examination. It lacks the conspicuous 

 posterior spine, the l)ristling antennules, the fleshy processes upon the 

 labrum, and the heavy armature of the postabdomen of Ophryoxus. 



Parophryoxus tubulatus sp. nov. 

 Type. — To be deposited in the U. S. National Museum, from Anony- 

 mous Pond (Crystal Lake), Maine, September 5, 1908. Collected also in 

 tTmbagog Lake, Maine and New Hampshire, July-August, 1905 ; Sebago 

 * Published here by permission of the Bureau of Fisheries. 



■23— Proc. Biol. Soc. W.\sh., Vol. XXII, 1909. (153) 



